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about to get car tuned stage 1 07 sti in cali wanted to change to sny. oil before i take in for tune. i have been planning on using royal purple for the last 11000 miles but today i read the subaru oil thread and it said some things negative about royal purple not being approved for subaru warranty or something . so basically just wondering what everyone runs miles on your cars and what oil you reccomend i can get royal purple for 7 bucks a quart and havent seen much redline aound .